| 1 |
Fungicides are teh pesticides which |
- A. Control the growth of fungus
- B. Kill insects
- C. Kill plant
- D. Kill herbs
|
| 2 |
Photochemical smog mainly consist of |
- A. Higher hydrocarbons
- B. Oxidising agnts
- C. Reducing agent
- D. All of these
|
| 3 |
The region of earth capable of supposing life is called. |
- A. Atmosphere
- B. Bisphere
- C. Dithosphere
- D. Hydrosphere
|
| 4 |
The main pollutant of leather tanneries in the waste water is due to |
- A. Lead
- B. Chromium VI
- C. Copper
- D. Chromium III
|
| 5 |
How much fresh water is used for domestic purpose |
- A. 8%
- B. 23%
- C. 69%
- D. 100%
|
| 6 |
Disinfection of water by chlorine is done by the production of. |
- A. NH2Cl
- B. NCl2
- C. HOCl
- D. NHCl2
|
| 7 |
Thickness of atmosphere is about how much kilometer above the surface of warth |
- A. 100 km
- B. 1000 km
- C. 10,000 km
- D. unlimited
|
| 8 |
The colloidal particles in raw water can be removed by |
- A. Coagulation
- B. Aeration
- C. Chlorination
- D. Hydration
|
| 9 |
The thickness of ozone layer is. |
- A. 25 to 50 km
- B. 25 to 28 km
- C. 3 km only
- D. 1 km only
|
| 10 |
In purification of potable water the coagulant used is |
- A. Nickel sulphate
- B. Copper sulphate
- C. Barium sulphate
- D. Alum
|